Implement document reconciliation v2

migrations/007_document_reconciliation_v2.sql

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+-- Document Reconciliation v2 (additive; no data backfill is run here).
+CREATE EXTENSION IF NOT EXISTS pgcrypto;
+
+CREATE TABLE IF NOT EXISTS opportunity_document_links (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    opportunity_id UUID NOT NULL REFERENCES opportunities(id) ON DELETE RESTRICT,
+    document_id UUID NOT NULL REFERENCES commercial_documents(id) ON DELETE RESTRICT,
+    document_kind TEXT NOT NULL,
+    relationship TEXT NOT NULL CHECK (relationship IN ('PRIMARY','SECONDARY','HISTORICAL','IGNORED','REMOVED','REASSIGNED','REVIEW_REQUIRED')),
+    is_manual BOOLEAN NOT NULL DEFAULT FALSE,
+    decision_reason TEXT,
+    decided_by TEXT,
+    decided_at TIMESTAMPTZ,
+    source TEXT NOT NULL,
+    origin_opportunity_id UUID REFERENCES opportunities(id) ON DELETE RESTRICT,
+    destination_opportunity_id UUID REFERENCES opportunities(id) ON DELETE RESTRICT,
+    correlation_id TEXT,
+    request_id TEXT,
+    restored_from_link_id UUID REFERENCES opportunity_document_links(id) ON DELETE SET NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    ended_at TIMESTAMPTZ,
+    metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
+    version INTEGER NOT NULL DEFAULT 1 CHECK (version > 0),
+    CONSTRAINT ck_document_link_reassigned CHECK (
+      relationship <> 'REASSIGNED' OR (
+        origin_opportunity_id IS NOT NULL AND destination_opportunity_id IS NOT NULL
+        AND origin_opportunity_id <> destination_opportunity_id
+      )
+    )
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS ux_document_link_current
+ON opportunity_document_links(opportunity_id, document_id) WHERE ended_at IS NULL;
+CREATE UNIQUE INDEX IF NOT EXISTS ux_document_link_primary_kind
+ON opportunity_document_links(opportunity_id, document_kind) WHERE ended_at IS NULL AND relationship = 'PRIMARY';
+CREATE INDEX IF NOT EXISTS idx_document_links_opportunity ON opportunity_document_links(opportunity_id, ended_at, relationship);
+CREATE INDEX IF NOT EXISTS idx_document_links_document ON opportunity_document_links(document_id, ended_at);
+CREATE INDEX IF NOT EXISTS idx_document_links_relationship ON opportunity_document_links(relationship, updated_at DESC);
+CREATE INDEX IF NOT EXISTS idx_document_links_destination ON opportunity_document_links(destination_opportunity_id) WHERE destination_opportunity_id IS NOT NULL;
+
+CREATE TABLE IF NOT EXISTS opportunity_document_link_events (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    link_id UUID REFERENCES opportunity_document_links(id) ON DELETE SET NULL,
+    opportunity_id UUID NOT NULL REFERENCES opportunities(id) ON DELETE RESTRICT,
+    document_id UUID NOT NULL REFERENCES commercial_documents(id) ON DELETE RESTRICT,
+    event_type TEXT NOT NULL,
+    actor TEXT NOT NULL,
+    reason TEXT,
+    old_relationship TEXT,
+    new_relationship TEXT,
+    old_opportunity_id UUID,
+    new_opportunity_id UUID,
+    old_jasmin_status TEXT,
+    new_jasmin_status TEXT,
+    correlation_id TEXT,
+    request_id TEXT,
+    idempotency_key TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    payload JSONB NOT NULL DEFAULT '{}'::jsonb
+);
+CREATE UNIQUE INDEX IF NOT EXISTS ux_document_link_events_idempotency
+ON opportunity_document_link_events(idempotency_key) WHERE idempotency_key IS NOT NULL;
+CREATE INDEX IF NOT EXISTS idx_document_link_events_link ON opportunity_document_link_events(link_id, created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_document_link_events_opportunity ON opportunity_document_link_events(opportunity_id, created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_document_link_events_document ON opportunity_document_link_events(document_id, created_at DESC);
+
+-- Command claims make the mutation itself idempotent, not merely its event.
+CREATE TABLE IF NOT EXISTS document_reconciliation_commands (
+    idempotency_key TEXT PRIMARY KEY,
+    fingerprint TEXT NOT NULL,
+    command_payload JSONB NOT NULL,
+    result_payload JSONB,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    completed_at TIMESTAMPTZ
+);
+
+-- Events are an audit ledger: UPDATE and DELETE are rejected at database level.
+CREATE OR REPLACE FUNCTION reject_document_link_event_mutation() RETURNS trigger
+LANGUAGE plpgsql AS $$ BEGIN RAISE EXCEPTION 'opportunity_document_link_events is append-only'; END $$;
+DROP TRIGGER IF EXISTS trg_document_link_events_append_only ON opportunity_document_link_events;
+CREATE TRIGGER trg_document_link_events_append_only BEFORE UPDATE OR DELETE ON opportunity_document_link_events
+FOR EACH ROW EXECUTE FUNCTION reject_document_link_event_mutation();
+
+ALTER TABLE commercial_document_lines ADD COLUMN IF NOT EXISTS commercial_document_id UUID REFERENCES commercial_documents(id) ON DELETE RESTRICT;
+UPDATE commercial_document_lines SET commercial_document_id = document_id WHERE commercial_document_id IS NULL;
+DO $$ BEGIN
+  IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname='ck_commercial_document_lines_document_present') THEN
+    ALTER TABLE commercial_document_lines ADD CONSTRAINT ck_commercial_document_lines_document_present
+      CHECK (commercial_document_id IS NOT NULL) NOT VALID;
+  END IF;
+END $$;
+ALTER TABLE commercial_document_lines VALIDATE CONSTRAINT ck_commercial_document_lines_document_present;
+ALTER TABLE commercial_document_lines ALTER COLUMN commercial_document_id SET NOT NULL;
+ALTER TABLE commercial_document_lines ADD COLUMN IF NOT EXISTS opportunity_document_link_id UUID REFERENCES opportunity_document_links(id) ON DELETE SET NULL;
+CREATE INDEX IF NOT EXISTS idx_document_lines_commercial_document ON commercial_document_lines(commercial_document_id);
+CREATE INDEX IF NOT EXISTS idx_document_lines_opportunity_link ON commercial_document_lines(opportunity_document_link_id);
+
+COMMENT ON TABLE opportunity_document_links IS 'Canonical ClientFlow document/opportunity relationship; legacy commercial_documents fields are not authoritative.';
+COMMENT ON TABLE opportunity_document_link_events IS 'Append-only reconciliation audit ledger.';